Rear skirt for an automobile



FIG. 1 is a perspective view of the rear skirt for an automobile showing the new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a side elevation view thereof;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a rear skirt for an automobile, as shown. 